package com.tianji.learning.service.impl;

import com.tianji.common.autoconfigure.mq.RabbitMqHelper;
import com.tianji.common.constants.MqConstants;
import com.tianji.common.exceptions.BizIllegalException;
import com.tianji.common.utils.CollUtils;
import com.tianji.common.utils.UserContext;
import com.tianji.learning.constants.RedisConstants;
import com.tianji.learning.domain.vo.SignResultVO;
import com.tianji.learning.mq.msg.SignInMessage;
import com.tianji.learning.service.ISignRecordService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.List;

@Service
@Slf4j
@RequiredArgsConstructor
public class SignRecordServiceImpl implements ISignRecordService {
    private final StringRedisTemplate redisTemplate;
    private final RabbitMqHelper mqHelper;
    @Override
    public SignResultVO addSignRecords() {
        // 获取当前登录用户id
        Long userId = UserContext.getUser();
        // 拼接key
        // SimpleDateFormat format = new SimpleDateFormat("yyyyMM");
        // format.format(new Date());
        LocalDate now = LocalDate.now();// 当前时间的年月
        String format = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.SIGN_RECORD_KEY_PREFIX + userId.toString() + format;
        // 利用bitset命令 将签到记录保存到redis的bitmap结构中 需要校验是否已签到
        int offset = now.getDayOfMonth() - 1; // 偏移量
        Boolean setBit = redisTemplate.opsForValue().setBit(key, offset, true);
        // 返回值是该offset上原来的值 原来为0是false 原来为1是true
        if (setBit) {
            // 说明当前已经签过到了
            throw new BizIllegalException("不能重复签到");
        }
        // 计算连续签到的天数
        int days = countSignDays(key, now.getDayOfMonth());

        // 计算连续签到 奖励积分
        int rewardPoints = 0;
        switch (days) {
            case 7:
                rewardPoints = 10;
                break;
            case 14:
                rewardPoints = 20;
                break;
            case 28:
                rewardPoints = 40;
                break;
        }
        // 保存积分 发送消息到mq
        mqHelper.send(MqConstants.Exchange.LEARNING_EXCHANGE,
                MqConstants.Key.SIGN_IN,
                SignInMessage.of(userId,rewardPoints + 1));
        // 封装vo返回
        SignResultVO vo = new SignResultVO();
        vo.setSignDays(days);
        vo.setRewardPoints(rewardPoints);
        return vo;
    }

    @Override
    public Byte[] querySignRecords() {
        // 获取当前登录用户
        Long userId = UserContext.getUser();
        // 拼接key
        LocalDate now = LocalDate.now();// 当前时间的年月
        String format = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.SIGN_RECORD_KEY_PREFIX + userId.toString() + format;
        // 取本月第一天到今天所有的签到记录
        int dayOfMonth = now.getDayOfMonth();
        // bitfield key get u天数 0
        List<Long> bitField = redisTemplate.opsForValue().bitField(key, BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0));
        if (CollUtils.isEmpty(bitField)) {
            return new Byte[0];
        }
        Long num = bitField.get(0);
        int offset = now.getDayOfMonth() - 1;
        // 利用& 封装结构
        Byte[] arr = new Byte[dayOfMonth];
        while (offset >= 0) {
            arr[offset] = (byte) (num & 1);// 计算最后一天是否签到 赋值结果
            offset--;
            num = num >>> 1;
        }
        return arr;
    }

    /**
     * 计算连续签到的天数
     *
     * @param key        缓存中的key
     * @param dayOfMonth 本月第一天到今天的天数
     * @return
     */
    private int countSignDays(String key, int dayOfMonth) {
        // 求本月第一天到今天签到的天数 bitFiled 得到的是十进制
        // bitField key get u天数 0
        List<Long> bitField = redisTemplate.opsForValue().bitField(key, BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0));
        if (CollUtils.isEmpty(bitField)) {
            return 0;
        }
        Long num = bitField.get(0);// 本月第一天到今天的签到天数 拿到的十进制
        log.debug("num {}", num);
        // num转二进制 从后往前推共有多少个一
        int counter = 0;// 计数器
        while ((num & 1) == 1) {
            counter++;
            num = num >>> 1;// 右移一位
        }
        return counter;
    }
}
